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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_CHROMEOS_POWER_BRIGHTNESS_OBSERVER_H_
      6 #define CHROME_BROWSER_CHROMEOS_POWER_BRIGHTNESS_OBSERVER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "chromeos/dbus/power_manager_client.h"
     11 
     12 namespace chromeos {
     13 
     14 // This observer listens for changes to the screen brightness and notifies
     15 // extensions and ash::PowerButtonController about them.
     16 class BrightnessObserver : public PowerManagerClient::Observer {
     17  public:
     18   // This class registers/unregisters itself as an observer in ctor/dtor.
     19   BrightnessObserver();
     20   virtual ~BrightnessObserver();
     21 
     22  private:
     23   // PowerManagerClient::Observer implementation.
     24   virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE;
     25 
     26   DISALLOW_COPY_AND_ASSIGN(BrightnessObserver);
     27 };
     28 
     29 }  // namespace chromeos
     30 
     31 #endif  // CHROME_BROWSER_CHROMEOS_POWER_BRIGHTNESS_OBSERVER_H_
     32